//
//  StatusCell.swift
//  Weibo
//
//  Created by 梁智 on 15/11/26.
//  Copyright © 2015年 lzfree. All rights reserved.
//

import UIKit

/// 微博 Cell 中控件的间距数值
let StatusCellMargin: CGFloat = 12
/// 微博头像的宽度
let StatusCellIconWidth: CGFloat = 35

/// 微博 cell
class StatusCell: UITableViewCell {

    /// 微博视图模型
    var viewModel: StatusViewModel? {
        didSet {
            //
            topView.viewModel = viewModel
            contentLabel.text = viewModel?.status.text
            pictureView.viewModel = viewModel
            
            // 测试动态修改行高
            pictureView.snp_updateConstraints { (make) -> Void in
                make.width.equalTo(pictureView.bounds.width)
                make.height.equalTo(pictureView.bounds.height)

            }
        }
    }
    
    /// 根据指定的视图模型设置行高
    ///
    /// - parameter vm: 视图模型
    ///
    /// - returns: 返回视图模型对应的行高
    func rowHeight(vm: StatusViewModel) -> CGFloat {
        // 记录视图模型 -> 会调用上面的 didSet 设置内容以及更新约束
        viewModel = vm
        // 强制更新所有约束
        layoutIfNeeded()
        // 返回底部视图的最大高度
        return CGRectGetMaxY(bottomView.frame)
    }
    
    // MARK: - 构造函数
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        selectionStyle = .None
        setupUI()
        
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: - 懒加载控件
    /// 顶部视图
    private lazy var topView: StatusCellTopView = StatusCellTopView()
    /// 微博正文标签
    lazy var contentLabel: UILabel = UILabel(title: "微博正文", fontSize: 15,
        color: UIColor.darkGrayColor(),
        screenInset: StatusCellMargin)
    /// 配图视图
    lazy var pictureView: StatusCellPictureView = StatusCellPictureView()
    /// 底部视图
    lazy var bottomView: StatusCellBottomCell = StatusCellBottomCell()

}

extension StatusCell {
    
    func setupUI() {
        contentView.addSubview(topView)
        contentView.addSubview(contentLabel)
        contentView.addSubview(pictureView)
        contentView.addSubview(bottomView)
        
        topView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(contentView.snp_top)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(2 * StatusCellMargin + StatusCellIconWidth)
        }
        contentLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(topView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left).offset(StatusCellMargin)
            
        }
        bottomView.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(pictureView.snp_bottom).offset(StatusCellMargin)
            make.left.equalTo(contentView.snp_left)
            make.right.equalTo(contentView.snp_right)
            make.height.equalTo(44)
//            // 指定向下的约束
//            make.bottom.equalTo(contentView.snp_bottom)
        }
    }
}
